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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
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    <div></div>
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    <!-- 
        ...运算符  将数组转为【参数序列】
     -->
</body>
<script>
     const BANZHANG=["1","2"];
      console.log(...BANZHANG);
    //   应用场景
    const A=["1","2"]
    const B=["3","4"]
    let c=[...A,...B]
    console.log(c);
    // 深拷贝
    const D=[...A]
    D[0]="5";
    console.log(A);
    console.log(D);
    // 将DOM的伪数组变成真正意义上的数组
    let divs=document.getElementsByClassName("div")
    console.log(divs);
    const divArr=[...divs]
    console.log(divArr);
</script>
</html>